Film applying apparatus

ABSTRACT

A film applying apparatus is provided with preparatory bonding rolls, laminating rolls, a laminated film wound out from a film roll and a substrate conveyed by a substrate conveying device. The laminated film passes between these rolls and pressure bonding is performed. The diameter of the preparatory bonding rolls is made smaller than the diameter of the laminating rolls. The range of the elastically deformed area at the roll surface where the grasping of the substrate and the laminated film by the preparatory bonding rolls is begun, is made small, thereby limiting the range and reducing the generated amount of air holding or the like.

DETAILED DESCRIPTION OF THE INVENTION

1. Field of the Invention

The present invention relates to a film applying apparatus for applyinga film to a surface of a substrate exemplified by a substrate for aprinted circuit board or a glass substrate of a liquid crystal displaydevice or a plasma display device by laminating rolls.

2. Description of the Prior Art

In a process for the manufacture of printed circuit boards used forelectronic equipment such as computers, a laminated film consisting of alight-transmissible support film (a synthetic resin film usuallyrepresented by polyester), a photosensitive resin layer formed on thesupport film and a cover film covering the resin layer is applied onto aconductive surface layer of a substrate for a printed circuit board(substrate width being 610 mm usually and 650 mm at most) after thecover film is removed. And then a circuit pattern film is overlaid, andthe photosensitive resin layer is exposed for a predetermined period oftime via the circuit pattern film and the light-transmissible supportfilm. Subsequently after the light-transmissible support film isremoved, the exposed photosensitive resin layer is developed and anetching mask pattern is formed, and then an unnecessary portion of theconductive layer is removed by etching thereby a printed circuit boardhaving a predetermined circuit pattern is formed. Also in a process offorming a display cell onto a glass substrate of a liquid crystaldisplay device or a plasma display device, a similar laminated film isapplied thereto.

In some film applying apparatus for applying a laminated film as abovedescribed, after a cover film is removed by a film separation member, acontinuous film wound on a film supply roll is guided to the leading endof a substrate being conveyed by a conveying means, with thephotosensitive resin layer located on the substrate side, and after thecontinuous film is temporarily tacked to the leading end of thesubstrate by a tacking means movable toward and away from the substrate,the substrate is conveyed by a lamination roll while the film is pressedto the substrate. The application under pressure of the film to thesubstrate is achieved so that the length of the application of the filmis substantially equal to the length of the substrate, and the suppliedfilm is cut into the predetermined length by a film cutting meansdisposed on or adjacent to the film tacking means.

The film tacking means as disclosed in JP-B 4-9656 for example, isconstituted by a main vacuum plate provided with a plurality of suctionholes (grooves) for sucking a film on a surface, and a main body of afilm tacking member of circular arc shape or triangular shape disposedto the leading end side in the film supply direction of the mainvacuumplate, and the film tacking member as a whole is moved toward andaway from the substrate so that the operation of film supply and tackingcan be performed.

As another pressure bonding system, there is a system of continuousapplying type where while a substrate is conveyed at regular intervalsin sequence, a laminated film is supplied without cutting continuouslyalong the conveyed substrate in parallel thereto, and both are sentbetween a pair of laminating rolls rotating and subjected to the thermalpressure bonding.

In the film applying apparatus of continuous applying type, since thelaminated film is wound out from a film supply roll and a cover film iscontinuously separated and sent in the laminating roll direction, afterthe winding-out leading end portion of the laminated film in the stateof the cover film being removed previously is grasped by a pinch rollusually disposed at the outlet side of the laminating roll via the guideroll and the laminating roll at the inlet side of the laminating roll,or after the winding-out leading end portion of the laminated film istemporarily tacked to the leading end of the leading end substrate bythe above-mentioned tacking means, the applying work is started.

When the laminated film is pressure-bonded to the substrate by a pair oflaminating rolls as above described, the laminating rolls are heated tothe predetermined temperature (about 130° C.) by means of the inductionheating or the like, and since the heating of the photosensitive resinlayer in the laminated film and the thermal pressure bonding to thesubstrate are performed simultaneously, there is a problem that thelaminated film in the applied state to the substrate is subjected towrinkles, looseness or holding an air therein.

On the contrary, in JP-A 57-198693 or JP-B 2-61024, two-stage filmapplying method is proposed where in a laminator for a substrate of aprinted circuit board, laminating rolls are constituted in two stages,and in the first stage, pressure bonding is performed at a lowertemperature than the thermal pressure bonding temperature andpreparatory bonding is performed, and at the second stage, pressure isapplied at the thermal pressure bonding temperature and the bonding iscompleted.

Here, in recent years, in the case of a plasma display substrate forexample, its size becomes very large being 800 mm×1000 mm or the like,and corresponding to this, also length of the laminating roll (the axiallength of the region pressing the substrate) naturally becomes as longas that exceeding 800 mm.

When the length (span) of the laminating roll is made large in suchmanner, also the diameter of the laminating roll becomes large.

The laminating roll is usually formed by applying rubber to the outercircumference of the metal roll, and when the film is applied to thesubstrate, the contact surface with the film is elastically deformedinto a plane shape by the pushing-down force.

Here, in any of the case of the continuous applying and the case thatthe leading end of the film is applied to the substrate by the tackingmember, the pair of laminating rolls are rotated and at the standbystate to the position spaced from the substrate conveying plane at the"OPEN" state until the leading end of the substrate enters the pressurebonding position, and when the leading end of the substrate is conveyedinto the pressure bonding position slightly exceeding the interaxispoint of the pair of laminating rolls, the leading end of the substrateis grasped and the "CLOSE" state is produced and the pressure bonding isstarted.

This prevents that the laminating roll collides with the edge portion atthe leading end of the substrate and pushes back the substrate or theouter circumference of the roll is broken. However, when the pair oflaminating rolls start the grasping of the substrate and the film, sincethe rubber lining applied to the outer circumference of the laminatingrolls is elastically deformed mainly in the film thickness direction asabove described and the deformation in the direction of pushing out anair between the film and the substrate and stretching wrinkles islittle, in the range of contacting with the elastically deformed portionat the substrate grasping state, after the applying, the laminated filmis liable to wrinkles, looseness or holding an air therein and thisproblem could not be solved even by the two-stage film applying methodas above described.

Therefore when the substrate becomes very large and corresponding tothis, the outer diameter of the laminating roll becomes large as abovedescribed, the range liable to the air holding or the like as abovedescribed naturally becomes large and the area of the pattern exposableregion with respect to the total area of the substrate becomes little,and a problem is produced in that the effective area ratio issignificantly decreased.

Further in the region liable to the air holding or the like in the filmapplying apparatus of continuous applying type, in some apparatus, thecover film and the photosensitive resin layer are half-cut in the filmwidth direction at the adjacent position to the end edge of eachsubstrate and the cover film except for the part corresponding betweenthe substrates is applied to the substrate. In this case, since it isunsuitable that the half cut line is set to the region liable to the airholding or the like, there is a problem that the substrate part and thefilm part not becoming the pattern exposure region increase and thewaste becomes much.

SUMMARY OF THE INVENTION

In view of the above-mentioned problems in the prior art, an object ofthe present invention is to provide a film applying apparatus whereinafter the applying as above described, a region of producing wrinkles,looseness or air holding in a lamination film can be suppressed small.

The present invention is in a film applying apparatus having a substrateconveying device for conveying a plurality of substrates along asubstrate conveying plane at intervals in sequence; a film guide meansfor guiding a laminated film constituted by lamination of at least aphotosensitive resin layer onto a light-transmissible support film andhaving width nearly equal to the substrate width, toward the substratein the state that the exposed photosensitive resin layer is directed toone surface of the conveyed substrate; and a pair of laminating rollshaving an elastic material laminated on the outer circumference andbeing heated and rotated, for performing the thermal pressure bonding ofthe laminated film and the substrate at the thermal pressure bondingtemperature, while the laminated film and the substrate are grasped andsent, wherein a pair of preparatory bonding rolls having an elasticmaterial laminated on the outer circumference and being rotated areinstalled at the upstream side of the laminating rolls, forpress-bonding the laminated film and the substrate at a temperaturelower than the thermal pressure bonding temperature and performing thepreparatory bonding, while the laminated film and the substrate aregrasped and sent, and the diameter in the preparatory bonding rolls atthe side of press-bonding the laminated film to the substrate and thepushing-down force at grasping the laminated film and the substrate arespecified so that the range of the elastic deformation into a planeshape contacting with the substrate via the film at the roll surfacebecomes 5 mm or less in the substrate conveying direction thereby theforegoing objects can be achieved.

Also the present invention is in a film applying apparatus having asubstrate conveying device for conveying a plurality of substrates withwidth being 800 mm or more along the substrate conveying plane atintervals in sequence; a film guide means for guiding a laminated filmconstituted by lamination of at least a photosensitive resin layer ontoa light-transmissible support film and having width nearly equal to thesubstrate width, towards the substrate in the state that thephotosensitive resin layer being exposed is directed to one surface ofthe substrate being conveyed; and a pair of laminating rolls with theaxial length being 800 mm or more and having an elastic materiallaminated on the outer circumference and being heated and rotated, forperforming thermal pressure bonding of the laminated film and thesubstrate at the thermal pressure bonding temperature, while thelaminated film and the substrate are grasped and sent, wherein a pair ofpreparatory bonding rolls having an elastic material laminated on theouter circumference and rotating are installed at the upstream side ofthe laminating rolls, for press-bonding the laminated film and thesubstrate at a lower temperature than the thermal pressure bondingtemperature and performing the preparatory bonding, while the laminatedfilm and the substrate are grasped and sent, and the diameter in thepreparatory bonding rolls at the side of press-bonding the laminatedfilm to the substrate and the pushing-down force at grasping thelaminated film and the substrate are specified so that the range of theelastic deformation into a plane shape at contacting with the substratevia the film on the roll surface becomes 5 mm or less in the substrateconveying direction thereby the foregoing objects can be achieved.

In the above-mentioned film applying apparatus, the diameter of thepreparatory bonding roll may be made 50˜120 mm.

In the above-mentioned film applying apparatus, the diameter of thelaminating roll may be made 110 mm˜300 mm, and the diameter of thepreparatory bonding roll may be made 0.1˜0.8 times of the diameter ofthe laminating roll.

In the above-mentioned film applying apparatus, the preparatory bondingrolls may be made non-heating rolls.

Also in the above-mentioned film applying apparatus, the preparatorybonding roll may be provided with a backup roll rolling contacting fromthe reverse side with the substrate in parallel.

In the above-mentioned film applying apparatus, at the downstream sideof the laminating roll, a film cutting device may be provided forcutting the laminated film in the width direction at the positionprojecting from the front and rear ends of the substrate, while thesubstrate and the laminated film applied to this are conveyed.

In the above-mentioned film applying apparatus, at the position betweenthe preparatory bonding roll and the laminating roll, a film cuttingdevice may be provided for cutting the laminated film in the widthdirection at the position projecting from the front and rear ends of thesubstrate, while the substrate and the laminated film applied to thisare conveyed, and the laminating roll may be detachably mounted on thefilm cutting device and the preparatory bonding roll.

In the present invention, the preparatory bonding roll is set so thatrange of the elastic deforming area of the roll outer circumference atpushing the film to the substrate becomes small, thereby the preparatorybonding is performed in the state that the region liable to wrinkles,looseness and air holding is little, and other than the above-mentionedregion in the preparatory bonding, in the state that the air holding isnot produced, the bonding is finished by the thermal pressure bonding inthe predetermined laminating rolls. Also since the laminating rolls maybe provided at the position spaced from other member such as the tackingmember, the outer diameter of the laminating rolls may be madesufficiently large and the film can be bonded securely.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic side view showing a film applying apparatusaccording to an embodiment of the invention;

FIG. 2 is a block diagram showing control system of the film applyingapparatus;

FIG. 3 is an enlarged plan view of a half cutter in the film applyingapparatus;

FIG. 4 is a diagram taken on line IV--IV in FIG. 3;

FIGS. 5A and 5B are schematic side view showing in enlargement ofposition relation of cutting position by the half cutter and asubstrate;

FIG. 6 is a schematic side view showing in enlargement of function of acover film peeling device in the film applying apparatus;

FIG. 7 is a side view showing in enlargement of relation of a touch rolland a laminated film in the cover film peeling device;

FIG. 8 is a schematic side view showing set state of a winding-outleading end part of a laminated film in the film applying apparatus;

FIG. 9 is a schematic side view showing a substrate bringing device anda temperature holding heater in the film applying apparatus;

FIG. 10 is a schematic side view showing relation of elastic deformingarea of preparatory bonding rolls and laminating rolls and a substratein a film applying apparatus;

FIG. 11 is a perspective view showing another embodiment of preparatorybonding rolls in a film applying apparatus;

FIG. 12 is a schematic side view showing main part of still anotherembodiment of a film applying apparatus; and

FIG. 13 is a schematic side view showing another embodiment of a filmapplying apparatus.

EMBODIMENTS OF THE INVENTION

Embodiments of the present invention will be described in detailreferring to the accompanying drawings as follows.

FIG. 1 shows a film applying apparatus 10 according to an embodiment ofthe present invention.

The film applying apparatus 10 comprises a substrate conveying device 14for conveying a plurality of substrates 16 with width being 800 mm ormore along a substrate conveying plane 14A at regular intervals insequence, a film roll 18 where a laminated roll 12 as above described isrolled, and a half cutter 22, a cover film peeling device 24, a suctionroll 26, a guide roll 28A in free rotation and a film guide roll 52arranged between the film roll 18 and preparatory bonding rolls 20A, 20Bin this order from the side of the film roll 18, and a cover film 12C ofthe laminated film 12 wound out from the film roll 18 is cut at thepredetermined position by the half cutter 22 and half cutter line isformed. Next, among each half cut interline part of the cover film 12C,only a part to be applied to the substrate 16 is peeled offintermittently by the cover film peeling device 24 and sent between thepreparatory bonding rolls 20A, 20B in the state that the photosensitiveresin layer 12B is exposed. Here, the exposed photosensitive resin layer12B is overlaid on the corresponding portion of the substrate 16conveyed by the substrate conveying device 14, and after the preparatorybonding is performed by the pressure bonding by the preparatory bondingrolls 20A, 20B, further the thermal pressure bonding is performed duringpassing between a pair of laminating rolls 21A, 21B thereby the bondingis performed completely.

These preparatory bonding rolls 20A, 20B and the laminating rolls 21A,21B are constituted in that an elastic material 23 (refer to FIG. 14)such as silicone rubber or silicone rubber with a surface coated by anon-adhesive film of fluororesin or the like is provided on outercircumference of a roll made of metal, and a heater (not shown) such asa thermal induction heating device is contained, and before starting theoperation of the apparatus, the laminating rolls 21A, 21B are heateduntil the surface becomes the thermal pressure bonding temperature (100°C.˜150° C.), and during the operation, the laminating rolls 21A, 21B arenormally rotated.

When the elastic material 23 is rubber, the thickness is preferably made1.5˜3 mm and the rubber hardness is preferably made 3˜30 kg/cm² in thepreparatory bonding rolls 20A, 20B and 3˜50 kg/cm² in the laminatingrolls 21A, 21B.

Also in the laminating rolls 21A, 21B, the diameter is as sufficientlylarge as 110˜300 mm so that the laminated film 12 solely can bethermally pressure-bonded to the substrate 16 and can be bondedcompletely. On the contrary, the preparatory bonding rolls 20A, 20B havesmaller diameter than that of the laminating rolls 21A, 21B, and thediameter and the pushing-down force are set so that when the substrate16 and the laminated film 12 are grasped, the range of the roll surfaceelastically deformed into a plane shape becomes 5 mm or less in thesubstrate conveying direction.

As above described, in order that the range of the elastic deformationinto a plane shape is made 5 mm or less, even if the diameter of thepreparatory bonding roll 20A is large, the pushing-down force may bemade small. However, if the pushing-down force is small, it may occurthat the preparatory bonding can not be performed. Therefore thediameter of the preparatory bonding roll 20A is made 0.1˜0.8 times ofthe diameter of the laminating roll 21A and selection of this and thepushing-down force-may be made.

More specifically, when the width of the substrate 16 is 800 mm, thediameter of the preparatory bonding rolls 20A, 20B and the laminatingrolls 21A, 21B may be made 84 mm and 110 mm (diameter ratio 0.764), 110mm and 160 mm (diameter ratio 0.688), 110 mm and 200 mm (diameter ratio0.55).

Also the preparatory bonding rolls 20A, 20B are normally rotated duringthe operation, and the surface is heated to a lower temperature thanthat of the laminating rolls 21A, 21B, for example, about 60° C.

A first nip roll 30, a full cutter 32 and a second nip roll 34 arearranged at the outlet side of the laminating rolls 21A, 21B in thesubstrate conveying direction in this order from the side of thelaminating rolls 21A, 21B.

A pair of vertical free rolls 36A, 36B are arranged in the vicinity ofthe outlet side of the film roll 18, and the upper end of the upper freeroll 36A and the upper end of the suction roll 26 are positioned onnearly the same horizontal plane.

Also the suction roll 26 has a number of suction holes (not shown)formed on the surface, and due to the negative pressure applied here,the laminated film 12 being wrapped is sucked, and prescribed tension issupplied to the laminated film 12 between the free rolls 36A, 36B andbetween the preparatory bonding rolls 20A, 20B.

In addition, since the laminated film 12 is wound out in the state thatthe torque in the film winding direction is imposed to the film roll 18by a torque motor 18A, tensile force is generated in the laminated film12 (tension with a suction roll 26 as hereinafter described may be 2˜10Kg preferably about 5 Kg when width of the laminated film 12 is 1000mm).

Also a rotary encoder 38 is connected to the free roll 36A, and pulse isoutputted to a control device 40 (refer to FIG. 2) in response to therotational speed of the free roll 36A when the laminated film 12 is sentin the direction of the suction roll 26.

The half cutter 22 as shown in FIG. 3 and FIG. 4 is constituted by acutter pedestal 42 which is fed between the suction roll 26 and the freeroll 36A horizontally and provided with a suction surface 42Asubstantially coincident with the feed surface of the laminated film 12,and a pair of disk cutters 44A, 44B movable in reciprocation along theupper surface of the cutter pedestal 42 in the film width direction.While the cutter pedestal 42 and the disk cutters 44A, 44B are moved inthe feed direction at the equal speed to that of the laminated film 12,the disk cutter 44A, 44B are moved in the film width direction and acover film 12C of the laminated film 12 at the upper surface side in thefigure is cut with the light-transmissible support film 12A remaining.

The pair of disk cutters 44A, 44B are spaced in the feed direction ofthe laminated film 12, and their distance as shown in FIG. 5 is madeslightly larger than the distance between the rear end of the precedingsubstrate 16 and the front end of the succeeding substrate 16 conveyedon the substrate conveying plane 14A.

The reciprocating motion of the cutter pedestal 42 and the disk cutters44A, 44B in the feed direction of the laminated film is performed by arack-and-pinion mechanism 46, and the reciprocating motion of the diskcutters 44A, 44B in the film width direction is performed by a one-axisrobot 48 respectively, and the rack-and-pinion mechanism 46 and theone-axis robot 48 are controlled by the control device 40.

The rack-and-pinion mechanism 46 is constituted by a rack 46A integralwith the cutter pedestal 42, a rail 46B supporting the rack 46A movablein reciprocation in the film feed direction and horizontally, and apinion 46C meshing with the rack 46A and driving this along the rail46B.

The cutter pedestal 42 is arranged long in the film width direction, andreceives tip of the disk cutters 44A, 44B at the upper surface. Forexample, cutter holders 45A, 45B of rod shape made of synthetic resinare embedded and arranged in the film width direction. The one-axisrobot 48 is arranged on the rack 46A. The one-axis robot 48 has a ballscrew mechanism (not shown), and drives the support pedestal 45supporting the disk cutters 44A, 44B in the film width direction.

The cover film peeling device 24 as shown in FIG. 1 and FIG. 6, isprovided with holding rolls 24A, 24B contacting with the lower side ofthe laminated film 12 in the film passing surface 13 at the positionsbetween the half cutter 22 and the suction roll 26, a touch roll 24Cdetachably contacting from the upper side with the holding roll 24B atthe side near the suction roll 26, an adhesive tape 24D having anadhesive layer formed on one surface and wrapped on the touch roll 24Cin the state that the adhesive layer is at the lower side in FIG. 1 andFIG. 6, and a winding device 24E for winding the leading end of theadhesive tape 24D.

Numeral 24F in FIG. 1 designates a nip roll which is disposed on theupper side of the holding roll 24A and grasps the laminated film 12 byits own weight in cooperation with the holding roll 24A and prevents thelaminated film 12 from floating when the cover film 12C is pulledupward, numeral 24G designates a tape brake which provides torque in thewinding direction to a tape roll 24H being a supply source of theadhesive tape 24D thereby supplies tension to the adhesive tape 24D,numerals 24I, 24J designate nip rolls which grasp the adhesive tape 24Dbetween the touch roll 24C and the winding device 24E, numeral 24Kdesignates a motor which drives the nip roll 24J at speed equal to thefeeding speed of the laminated film 12 in the direction of winding theadhesive tape 24D, numeral 24L designates a motor which drives thewinding roll in the winding device 24E, numeral 24M in FIG. 6 designatesa rocker lever which supports the touch roll 24C in detachablycontacting state with the holder roll 24B, and numeral 24N designates atouch cylinder which drives the rocker lever 24M respectively.

The nip roll 24I is a roll with its surface roughened (usually thesurface roughness Ra is about 10 μm). More specifically, its outercircumference is metal, and the metal surface is subjected to blasttreatment and mold releasing coating of fluororesin, silicone resin orthe like is performed and the photosensitive resin adhering to theadhesive layer of the adhesive tape 24 and the cover film 12C does notadhere.

The touch cylinder 24N is controlled by the control device 40, and amongparts between the disk cutters 44A, 44B in the cover film 12C divided bythe half cutter 22, in substantially front half part in the film sendingdirection (arrow direction in FIG. 6), the adhesive tape 24 does notcontact, and from substantially rear half part in the film sendingdirection to the half cut line 49A of the disk cutter 44A at the rearside (the right side in FIG. 6), the adhesive tape 24 contacts and thepeeling of the cover film 12 is started from the half cut line 49A, anduntil the position just before the half cut line 49B of next disk cutter44B, the touch roll 24C is driven via the rocker lever 24M so that theadhesive tape 24D adheres to the cover film 12C.

The adhesive tape 24D together with the cover film 12C adhered to this,is wound to the winding device 24E via the nip rolls 24I, 24J, therebythe cover film 12C is separated from the photosensitive resin layer 12B.

Accordingly on the light-transmissible support film 12A, as shown inFIG. 5 and FIG. 6, the cover film 12C of equal length remains betweenthe disk cutters 44A, 44B in equal pitch to the conveying pitch of thesubstrate 16.

In addition, as shown in FIG. 7, the touch roll 24C pushes the coverfilm 12C from the front side in the traveling direction of the laminatedfilm 12, at the position shifted slightly to the left in the figure fromthe apex of the holder roll 24B.

Numeral 24P in FIG. 6 designates a lever which supports the nip roll 24Irockable, numeral 24Q designates a spring which energizes the lever 24Pin the direction that the nip roll 24I pushes the nip roll 24J, numeral24R designates a guide roll, numeral 24S designates a separationconfirming sensor which confirms whether or not the separated cover film12C adheres to the adhesive tape 24D, numeral 24T designates a supportshaft which supports the rocker lever 24 rockable, and numeral 24Udesignates a guide roll which is rotatably supported by the supportshaft 24T and to which the non-adhesive surface side of the adhesivetape 24S wound out from the tape roll 24H is wrapped, respectively.

Also numeral 24X designates a support bar with both ends mounted on adevice frame (not shown) and arranged in parallel to the holder rolls24A, 24B or the like. The support lever 24X supports the touch cylinder24N and supports the guide roll 24R rotatable via a plate spring 24Y ofU-like shape.

Since the plate spring 24Y is elastically deformed, the guide roll 24Rprevents that the adhesive tape 24D becomes slack.

Among the preparatory bonding rolls 20A, 20B and the laminating rolls21A, 21B, the preparatory bonding roll 20A and the laminating roll 21Aat upper side is driven by roll clamp cylinders 50, 51 between the"CLOSE" position where the substrate 16 and the laminated film 12 arepushed down with the preparatory bonding roll 20B and the laminatingroll 21B at the lower side and the "OPEN" position spaced upward so asto produce non-contact state with the substrate 16 and the laminatedfilm 12 passing between both.

The first and the second nip rolls 30, 34 are made detachably contactedfrom upper side with the conveying roll 15A at the lower side by thefirst clamp cylinder 30A and the second clamp cylinder 34A respectively,and when the laminated film 12 or the laminated film 12 and thesubstrate 16 are grasped between the first and second nip rolls 30, 34and the conveying roll 15A or the belt 15C to be wound around this,these can be conveyed in the right direction in FIG. 1 by the rotationof the conveying roll 15A.

Numeral 15B in FIG. 1 and FIG. 8 designates conveying rolls which aredisposed on the front side of the preparatory bonding rolls 20A, 20B andthe rear side of the laminating rolls 21A, 21B respectively and rotatedat equal speed in synchronization with the conveying roll 15A.

The full cutter 32 is provided with a cutter pedestal 32A moved inreciprocation so as to move along the lower side of the substrateconveying plane 14A in synchronization with the substrate conveyingdirection and to return in the reverse direction, a cutter edge 32Breciprocated in the substrate conveying direction together with thecutter pedestal 32A and traveling in the film width direction while thecutter pedestal 32A travels in synchronization with the substrate 16conveyed along the substrate conveying plane 14A for cutting thelaminated film 12 with the cutter pedestal 32A, a traveling drive device32C for traveling the cutter edge 32B in the substrate width direction,and a traveling cylinder 32D for traveling (forward) the cutter pedestal32A, the cutter edge 32B and the traveling drive device 32C insynchronization with the substrate conveying direction.

Also numeral 54 in FIG. 1 designates a film heater disposed at the inletside of the preparatory bonding rolls 20A, 20B for heating the laminatedfilm 12. The film guide roll 52 is disposed at the upstream side of thefilm heater 54, and changes the film path of the laminated film 12 innon-contact state with both the preparatory bonding rolls 20A, 20B andthe laminating rolls 21A, 21B and is arranged rockable so that it isnon-contact state with the laminated film 12 during the applyingoperation by the preparatory bonding rolls 20A, 20B.

At the lower side of the substrate conveying plane 14A, a succeedingsubstrate start sensor 56 acting also as a substrate rear end sensor isarranged to the position in the vicinity of the inlet side of thepreparatory bonding rolls 20A, 20B, and in the position spaced from thisat the upstream side, a substrate standby sensor 58 acting also as asubstrate front end sensor is arranged, and further at the upstream sideof the succeeding substrate start sensor 56, a free roll 59 constitutinga part of the substrate conveying plane is arranged.

Numeral 60 in FIG. 1 designates a servo motor for conveyor roll drivingso as to drive the conveyor roll 14C in the substrate conveying device14 and the conveying roll train 14B at the upstream thereof, numeral 62designates a nip roll for grasping the substrate 16 with the conveyorroll 14C and stabilizing the conveying of the substrate, numeral 62Adesignates a cylinder for opening and closing the nip roll 62, andnumeral 64 designates a temperature holding heater for heating thesubstrate 16 being conveyed on the substrate conveying plane 14A so thatits temperature is not decreased excessively.

At the upstream side of the temperature holding heater 64 along thesubstrate conveying plane 14A, as shown in FIG. 9, a substrate bringingdevice 68 is arranged, and further at the upstream side, a substrateheater (not shown) is arranged.

The substrate bringing device 68 is constituted by a conveying rolltrain 68A, a robot 68B which elevates the substrate 16 conveyed onto theconveying roll train 68A and then sends it horizontally to the lowerside of the temperature holding heater 64 and falls and transfers thesubstrate 16 onto the conveying roll train 14B and returns to theposition at the lower side of the conveying roll train 68A, and abringing roll train 68C which pushes from lateral sides the substrate 16elevated to the upper side of the conveying roll train 68A by the robot68B thereby performs the centering in the width direction.

Numeral 68D in FIG. 9 designates a substrate position detecting sensorarranged at the inlet side of the conveying roll train 68A, and numeral68E designates a substrate position detecting sensor arranged at theoutlet side thereof respectively.

The robot 68B is provided with a horizontal substrate putting surfacebeing long in the substrate conveying direction for putting thesubstrate 16 thereon, and the negative pressure is applied to thesubstrate putting surface, and a plurality of suction holes (not shown)are provided for sucking the substrate 16 and holding it horizontallyand also a heater (not shown) is provided for suppressing the partialcooling of the substrate 16.

The substrate putting surface is made a metal surface, and if necessary,the metal surface may be coated by a non-adhesive film such asfluororesin.

Here the first and the second nip rolls 30, 34 and a nip roll 62 areconstituted in that an elastic material such as silicone rubber orsilicone rubber with a surface coated by a non-adhesive film such asfluororesin is provided on an outer circumference of a metallic roll.

The nip roll 62 is lowered via the control device 40 by a cylinder 62Abased on an output signal when the substrate standby sensor 58 detectsthe leading end of the substrate, and the nip roll 62 can grasp thesubstrate with the conveyor roll 14C.

When the succeeding substrate start sensor 56 detects the leading end ofthe substrate sent onto the substrate conveying plane 14A, the servomotor 60 is made speed "zero"by the control device 40 and stops thesubstrate temporarily, and next the servo motor 60 is rotated in thetiming and the speed so that the substrate 16 is synchronized with thelaminated film 12.

In addition, the conveying roll 15A at the downstream side from thelaminating rolls 21A, 21B and the conveyor roll 14C at the upstreamside, and the conveying roll train 14B and the conveying roll train 68Aare independent from each other and the rotation and the stopping arecontrolled by the control device 40.

Also the negative pressure of the suction roll 26 is adjusted by thecontrol device 40 so that force imposed to the guide roll 28A isdetected by the load cell 27 and the detected value, that is, thetensile force given to the laminated film 12 becomes constant.

Numeral 18B in FIG. 1 designates a film remaining amount sensor of thefilm roll 18, and numeral 24V designates a winding amount sensor in thewinding device 24E. Any of these sensors 18E, 24V is a line sensor wherea plurality of optical sensors are arranged in radial directions of theroll, and a signal is outputted corresponding to the film remainingamount or the file winding amount.

Next, in the film applying apparatus 10, the leading end of thelaminated film 12 is wound out from the roll 18 and passes between thepreparatory bonding rolls 20A, 20B and the laminating rolls 21A, 21B andthen is set, and next process of applying to the substrate 16 will bedescribed.

Before the laminated film 12 is wound out, the touch roll 24C of thecover film peeling device 24 is at the position where it does notcontact with the cover film 12C, and also the film guide roll 52 rocksin the position where the laminated film 12 does not contact with thepreparatory bonding rolls 20A, 20B. Also the torque motor 18A is turnedON, and the tensile force is produced while the laminated film 12 iswound out.

Further temperature of the film heater 54 and the temperature holdingheater 64 is raised to the predetermined temperature (100˜150° C.), andalso the laminating rolls 21A, 21B are heated to similar degree and inrotating state normally. Also the preparatory bonding rolls 20A, 20B areheated to a lower temperature than the predetermined temperature.

The leading end of the laminated film 12 wound out from the film roll18, as shown in FIG. 8, passes between the preparatory bonding rolls20A, 20B and the laminating rolls 21A, 21B previously opened and ispulled to the position of the first and the second nip rolls 30, 34, andin this state, the first and the second nip rolls 30, 34 are lowered bythe first and the second clamp cylinders 30A, 34A and the laminated film12 is grasped between the nip roll and the conveying roll 15A.

When the film applying work is started, the conveying roll 15A and thesuction roll 26 at the downstream side of the laminating rolls 21A, 21Bare driven, and the laminated film 12 is wound out from the film roll 18and sent.

At the same time, while the half cutter 22 is traveled insynchronization with the laminated film 12, the disk cutters 44A, 44Bare driven in the film width direction and the cover film 12C is cut.

Then in order that cutting of the cover film 12C by the disk cutters44A, 44B is made complete, the disk cutters 44A, 44B may cut also thephotosensitive resin layer 12B and further slightly cut into thelight-transmissible support film 12A.

The position of the half cut line of the cover film 12C by the halfcutter 22 is seen by the number of pulses outputted from the rotaryencoder 38, and also by the pulse signal, the timing of the half cutline 49A by the disk cutter 44A at the right side in FIG. 1 attaining tothe position of the touch roll 24C in the cover film peeling device 24is seen.

Consequently the touch roll 24C is lowered via the touch cylinder 24N bythe control device 40 in this timing, and pushing of the adhesivesurface of the adhesive tape 24D wrapped to the touch roll 24C to thecover film 12C is started from the center position in the film sendingdirection of the separation part in the cover film 12C to the positionimmediately before the half cut line 49A by the disk cutter 44A.

Since the rotary center axis of the holder roll 24B is slightly shiftedto the rear side in the laminated film sending direction from the centeraxis line of the touch roll 24C in the contacting state to the outercircumference of the holder roll 24B via the laminated film 12 and theadhesive tape 24D, the laminated film 12 contacting with the holder roll24B becomes a convex curved surface in the side of the cover film 12Cand is opened in the part of the half cut line 49A.

Consequently when the adhesive surface of the adhesive tape 24D contactsfrom the front side of the half cut line 49A, peeling of the cover film12C is easily started from the position of the half cut line 49A by thedisk cutter 44A and the cover film 12C together with the adhesive tape24D is wound to the winding device 24E.

Here since the adhesive tape 24D is pulled by the nip roll 24J driven bythe motor 24K at equal speed to that of the laminated film 12C and thesame direction at the touch roll 24C, the adhesive tape 24D touches withor is separated from the cover film 12C thereby variation of the tensiongiven to the laminated film 12 can be made quite small.

In addition, if the pushing start timing of the adhesive surface of theadhesive tape 24D to the cover film 12C is too early in comparison withthe above description, the cover film 12C in a part not to be separatedwill be separated. If it is too late, the separation can not beperformed.

Next, from the timing of the cover film 12C separated together with theadhesive tape 24D being grasped by the nip rolls 24I, 24J to the timeimmediately before the half cut line 49B by the disk cutter 44B produceddue to next cutting by the half cutter 22 arriving to the position ofthe touch roll 24C, the touch roll 24C is driven by the control device40 in the direction separating from the laminated film 12, and the coverfilm 12C adhered to the adhesive tape 24D is separated from thelaminated film 12 at the position of the half cut line by the cutter44B.

Thereby the cover film 12C of the position between the half cut lines49A, 49B by the disk cutters 44A, 44B is not separated but remains onthe light-transmissible support film 12A and the photosensitive resinlayer 12B and then passes through the suction roll 26 and is sent in thedirection of the preparatory bonding rolls 20A, 20B.

In addition, if the timing of separating the touch roll 24C from thelaminated film 12 is too early in comparison with the above description,the cover film 12C adhered to the adhesive tape 24D is pulled by thelaminated film 12 and may be separated from the adhesive tape 24D. If itis too late, the adhesive tape 24D adheres to the cover film 12C of nextpart not to be separated and may separate this.

Before the half cut line 49A by the disk cutter 44A on the cover film12C due to the first cutting approaches the preparatory bonding rolls20A, 20B, the front substrate 16 passes through the substrate bringingdevice 68 and is conveyed onto the conveying roll train 14B at lowerside of the temperature holding heater 64. If the leading end of thesubstrate 16 is detected by the substrate standby sensor 58, the niproll 62 is lowered by the control device 40 in the timing coincidentwith the top end of the substrate 16 and grasps the substrate 16 withthe conveyor roll 14C.

After the conveying roll train 14B and conveyor roll 14C are madeconveying speed "zero" by the servo motor 60, in the timing and thespeed that the half cut line 49A on the cover film 12C is coincidentwith the position slightly after the leading end in the sendingdirection of the front substrate 16, the substrate 16 is sent betweenthe preparatory bonding rolls 20A, 20B by the substrate conveying device14 in synchronization with the laminated film 12.

The timing of the leading end part of the front substrate 16 attainingto the preparatory bonding rolls 20A, 20B and the laminating rolls 21A,21B is estimated from relation of the position of the substrate standbysensor 58, the distance between the preparatory bonding rolls 20A, 20Band the laminating rolls 21A, 21B and the conveying speed by the servomotor 60.

In the timing of the leading end of the substrate 16 attaining to thepreparatory bonding rolls 20A, 20B estimated in such manner, thepreparatory bonding roll 20A at the upper side is lowered by the rollclamp cylinder 50, and the leading end of the front substrate 16together with the laminated film 12 is grasped between the loweredpreparatory roll 20A and the preparatory roll 20B at the lower side andis subjected to the pressure bonding (preparatory bonding) by therotation of the preparatory bonding rolls 20A, 20B and is sent to theright direction in FIG. 1.

In the timing of the preparatory bonding roll 20A at the upper sidelowering, the film guide roll 52 is driven in separating direction fromthe laminated film 12 in FIG. 1. Thereby the laminated film 12 isgrasped by the preparatory bonding rolls 20A, 20B.

Next in the timing that the leading end of the front substrate 16passing through the preparatory bonding rolls 20A, 20B attaining to thelaminating rolls 21A, 21B, the laminating roll 21A at the upper side islowered by the roll clamp cylinder 51 and the leading end of thesubstrate 16 together with the laminated film 12 is grasped between thelaminating rolls 21A, 21B and is subjected to the thermal pressurebonding to the predetermined temperature due to the rotation of theseand is sent out to the right direction in FIG. 1 and the film applyingis finished.

As shown in FIG. 14, the preparatory bonding rolls 20A, 20B have thediameter smaller than that of the laminating rolls 21A, 21B, and thediameter and the pushing-down force are specified so that range of theelastic deformation area S1 of the contact surface of the elasticmaterial 23 on the outer circumference of the preparatory bonding rolls20A, 20B with the laminated film 12 begun to be deformed flat is made 5mm or less in the substrate traveling direction, when the preparatorybonding rolls 20A, 20B grasp the substrate 16 and the laminated film 12.Consequently the region liable to generating an air bubble holding,wrinkles, looseness is small, and the preparatory bonding is performed.

Since the temperature of the preparatory bonding rolls 20A, 20B are setlower than the thermal pressure bonding temperature, the substrate 16and the laminated film 12 are not fixedly bonded while they pass throughthe preparatory bonding rolls 20A, 20B.

The substrate 16 and the laminated film 12 subjected to the preparatorybonding by the preparatory bonding rolls 20A, 20B are grasped by thelaminating rolls 21A, 21B heated to the predetermined temperature asabove described, and are completely bonded while passing between both.Then in the region after the elastic deformable area S1 of the elasticmaterial 23, since the substrate 16 and the laminated film 12 arecontacted not strongly but uniformly due to the preparatory bonding bythe preparatory bonding rolls 20A, 20B, even within the elasticdeformable area S2 where the elastic material 23 of the laminating rolls21A, 21B starts the deformation, air holding or the like does not occur,and the laminated film 12 can be applied between the substrate 16 bysufficient contacting force.

Accordingly only the elastic deformable area S1 of the preparatorybonding rolls 20A, 20B becomes a range liable to air holding or thelike, thereby decrease of the pattern exposure region is little.

Also the position of the half cut line 49A of the cover film 12C neednot be significantly shifted to the rear side from the leading end ofthe substrate 16 and there is no waste.

In addition, when the laminated film 12 is press-bonded to the substrate16 using the laminating rolls 21A, 21B solely, in the pushing-down forcesufficient for the bonding, range of the elastic deformable area S2 inthe elastic material 23 of the laminating rolls 21A, 21B in thesubstrate traveling direction is about 6 mm when the roll diameter is110 mm and about 20 mm when the roll diameter is 300 mm.

Regarding the second substrate 16 and so forth succeeding the firstsubstrate 16, while the substrates succeeding the first substrate 16 areconveyed at prescribed intervals by the substrate conveying device 14,the cover film 12C in the part to be applied to the substrate isseparated in sequence by the cover film peeling device 24, and both arebonded by thermal pressure bonding while passing between the preparatorybonding rolls 20A, 20B and the laminating rolls 21A, 21B. Thepreparatory bonding roll 20A and the laminating roll 21A at the upperside are made "OPEN" state by the roll clamp cylinders 50, 51 at the gapposition between the substrates 16 conveyed intermittently, and they arelowered and made "CLOSE" state at the time of the leading end of thesubstrate 16 attaining there.

In addition, the laminated film 12 at the leading end side in thesending direction from the part applied to the substrate 16 is sent fromthe position of the second nip roll 34 to the lower side than thesubstrate conveying plane 14A in the state that the cover film 12C isapplied, and when the laminated film 12 is cut by the full cutter 32 inthe slightly front position from the leading end of the first substrate16, the laminated film 12 is wasted downward from the second nip roll34.

Accordingly since the cover film 12C remains being applied to the partfrom the winding-out leading end of the laminated film 12 wound out fromthe film roll 18 to the cut position by the half cutter 22 when theleading end of the laminated film 12 is set to the position passingthrough the second nip roll 34, the photosensitive resin layer 12B isnot exposed or the exposed photosensitive layer 12B adhere to the niproll or the like or wrapped around this after starting the operation.

In the prior art, the cover film 12C is peeled off from the winding-outleading end of the laminated film 12 wound out from the film roll 18 andsetting is performed where the photosensitive resin layer 12B isexposed. However, since the photosensitive resin layer 12B deterioratesdue to oxygen in the air at lapse of about 30 seconds after the coverfilm 12C is peeled off, in this range, the photosensitive resin layer12B is wasted without applying to the substrate 16.

In the above-mentioned embodiment, the diameter of the preparatorybonding rolls 20A, 20B is made 50 mm at least. This is determined fromthat when the laminating roll is heated, a heater such as an inductionheating device must be installed within it. The minimum diameter is 30mm when the heater is not installed. This is the limit value when thedeflection due to the pushing-down force is made the definite value orless. If the diameter is still made smaller, the deflection is liable tobe generated.

Also in any of the case that the heater is installed in the preparatorybonding roll or the case that it is not installed, for example, as shownin FIG. 11, the preparatory bonding rolls 20C, 20D with smaller diametermay be supported by the backup rolls 70A, 70B with larger diameter fromthe upper side and the lower side of the preparatory bonding rolls 20C,20D.

In this case, the preparatory bonding rolls 20C, 20D are constituted inthat rubber is coated on the outside of a metal roll in similar to thatof the preparatory bonding rolls 20A, 20B, and the backup rolls 70A, 70Bmay be a metal surface.

In addition, the laminating roll 20C and the backup roll 70A at theupper side are synchronized individually and rotated and driven, and aredriven to the "OPEN" position and the "CLOSE" position simultaneously bythe roll clamp cylinder 50.

The preparatory bonding rolls 20C, 20D with smaller diameter in the caseof sole use is liable to be deflected during the pushing down, but sincethe preparatory bonding rolls 20C, 20D are backed up by the backup rolls70A, 70B with larger diameter, the deflection is not generated.

In the prior art, the outer circumference of the laminating rolldirectly contacting with the laminated film 12 is formed by elasticmaterial liable to abrasion, such as rubber. However, since it isabraded in a short time, there is a problem that the laminating rollmust be replaced frequently and the running cost becomes excessive.

On the contrary, since the backup rolls 70A, 70B in FIG. 11 do notcontact with the laminated film 12 directly, the whole body may beconstituted by metal and the anti-abrasion property can be improvedsignificantly. In this case, the preparatory bonding rolls 20C, 20D withsmall diameter coated by rubber must be exchanged in a short time, butsince it is of small diameter, the cost is low and the exchanging iseasy.

When the substrate width exceeds 800 mm, the laminating rolls 21A, 21Bmay be provided with a backup roll.

Although the preparatory bonding rolls 20A, 20B in FIG. 1 and thepreparatory bonding rolls 20C, 20D in FIG. 11 have the equal diameter inthe upper side and the lower side, the present invention is not limitedto this but only the side contacting with the laminated film 12 may bemade smaller diameter.

In the case of the film applying apparatus 10, although the winding-outleading end part of the laminated film 12 wound out from the film roll18 is grasped by the nip roll and set, the preparatory bonding roll 20Aat the upper side may be lowered and the laminated film 12 may begrasped with the preparatory bonding roll 20B at the lower side.

Further in the film applying apparatus 10, although relation of thelaminating rolls 21A, 21B and the preparatory bonding rolls 20A, 20B isfixed, the laminating rolls 21A, 21B may be detachably mounted.

For example, as shown in FIG. 12, the laminating rolls with smallerdiameter in the film applying apparatus for a printed circuit board inthe prior art may be made preparatory bonding rolls 20E, 20F in thepresent invention and laminating rolls 21C, 21D with larger diameter maybe connected and arranged to the outlet side of the film applyingapparatus thus the film applying apparatus 11 of the present inventionmay be constituted.

In this case, the full cutter (film cutting device) 33 is arranged atthe outlet side of the preparatory bonding rolls 20E, 20F. Thelaminating rolls 21C, 21D are mounted at the outlet side of the fullcutter 33 at the after attachment or mounted to other frame (pedestal)and arranged at the outlet side of the full cutter 33.

Also peeling means of the cover film 12C is not limited to the adhesivetape but an adhesive roll or a suction device by negative pressure, forexample, a suction roll with a number of suction holes and negativepressure is imposed thereto may be used.

In the film applying apparatus 10, although the cover film 12C is cut bythe half cutter 22 and then the cover film 12C is separatedintermittently, the present invention is not limited to this but may beapplied also regarding the case that the whole cover film 12C iscontinuously separated and applied to the substrate 16.

In this case, the half cutter 22 cuts the cover film 12C at one positionin the width direction by the first cutting operation of one time afterthe film is set, and the peeling start line is formed and the cutting isonly one time regarding one film roll 18.

The film applying apparatus 10 is so-called continuous applying typewhere the laminated film 12 is continuously applied to the substrate 16conveyed continuously at regular intervals, but may be applied also to afilm applying apparatus as shown in FIG. 13, where the laminated film inresponse to the substrate length is cut by a cutter and then applied ineach substrate to be applied. After a cover film 12C is continuouslyseparated by a film separating member 112, a laminated film 12 wound outfrom a film roll 18 is guided to the leading end of each substrate 16conveyed by substrate conveying device 14 so that a photosensitive resinlayer 12B becomes the substrate side, and the leading end art of thelaminated film 12 is sucked by a tacking member 114 movable close andremote from the substrate, and after the leading end of the laminatedfilm 12 is tacked to the leading end of the substrate 16 by the top endof the tacking member 114, while the film is bonded in the preparatorybonding rolls 20A, 20B and the laminating rolls 21A, 21B, the substrate16 together with the laminated film is conveyed.

As above described, the pressure bonding applying of the laminated filmto the substrate 16 is performed so that the applying length becomeslength corresponding to the substrate length, and in order to make suchlength, the laminated film 12 is cut by the film cutting means such as arotary cutter 116 provided in the film tacking member 114 itself or inthe member in the vicinity.

In each embodiment, although the laminating roll is constituted insingle stage, this may be constituted in two stages or more.

Further in each embodiment, although the axial length and the substratewidth of the laminating roll and the preparatory bonding roll is made800 mm or more, the present invention is not limited to this, but may beapplied also to the case that it is less than 800 mm and the pushingdownforce of the laminating roll for the film applying is large and range ofpushing the substrate on the roll surface and performing elasticdeformation into a plane shape is large.

What is claimed is:
 1. A film applying apparatus comprising:a substrateconveying device for conveying a plurality of substrates along asubstrate conveying plane at intervals in sequence; a film guide meansfor guiding a laminated film constituted by lamination of at least aphotosensitive resin layer onto a light-transmissible support film andhaving width nearly equal to the substrate width, toward the substratein the state that the exposed photosensitive resin layer is directed toone surface of the conveyed substrate; and a pair of laminating rollshaving an elastic material laminated on the outer circumference andbeing heated and rotated, for performing the thermal pressure bonding ofthe laminated film and the substrate at the thermal pressure bondingtemperature, while the laminated film and the substrate are grasped andset, wherein a pair of preparatory bonding rolls having an elasticmaterial laminated on the outer circumference and being rotated areinstalled at the upstream side of the laminating rolls, forpress-bonding the laminated film and the substrate at a temperaturelower than the thermal pressure bonding temperature and performing thepressure bonding, while the laminated film and the substrate are graspedand sent, and the diameter in the preparatory bonding rolls at the sideof press-bonding the laminated film to the substrate and thepushing-down force at grasping the laminated film and the substrate arespecified so that the range of the elastic deformation into a planeshape contacting with the substrate via the film at the roll surfacebecomes 5 mm or less in the substrate conveying direction.
 2. A filmapplying apparatus comprising:a substrate conveying device for conveyinga plurality of substrates with width being 800 mm or more along thesubstrate conveying plane at intervals in sequence; a film guide meansfor guiding a laminated film constituted by lamination of at least aphotosensitive resin layer onto a light-transmissible support film andhaving width nearly equal to the substrate width, towards the substratein the state that the photosensitive resin layer being exposed isdirected to one surface of the substrate being conveyed; and a pair oflaminating rolls with the axial length being 800 mm or more and havingan elastic material laminated on the outer circumference and beingheated and rotated, for performing thermal pressure bonding of thelaminated film and the substrate at the thermal pressure bondingtemperature, while the laminated film and the substrate are grasped andsent, wherein a pair of preparatory bonding rolls having an elasticmaterial laminated on the outer circumference and rotating are installedat the upstream side of the laminating rolls, for press-bonding thelaminated film and the substrate at a lower temperature than the thermalpressure bonding temperature and performing the preparatory bonding,while the laminated film and the substrate are grasped and sent, and thediameter in the preparatory bonding rolls at the side of press-bondingthe laminated film to the substrate and the pushing-down force atgrasping the laminated film and the substrate are specified so that therange of the elastic deformation into a plane shape at contacting withthe substrate via the film on the roll surface becomes 5 mm or less inthe substrate conveying direction.
 3. A film applying apparatus as setforth in claim 1, wherein the diameter of the preparatory bonding rollis made 50˜120 mm.
 4. A film applying apparatus as set forth in claim 1,wherein the diameter of the laminating roll is 110 mm˜300 mm, and thediameter of the preparatory bonding roll is 0.1˜0.8 times of thediameter of the laminating roll.
 5. A film applying apparatus as setforth in claim 1, wherein the preparatory bonding roll is a non-heatingroll.
 6. A film applying apparatus as set forth in claim 1, wherein thepreparatory bonding roll is provided with a backup roll rollingcontacting from the reverse side with the substrate in parallel.
 7. Afilm applying apparatus as set forth in claim 1, wherein a film cuttingdevice is provided at the downstream side of the laminating roll, forcutting the laminated film in the width direction at the positionsprojecting from the front and rear ends of the substrate, while thesubstrate and the laminated film applied to this are conveyed.
 8. A filmapplying apparatus as set forth in claim 1, wherein a film cuttingdevice is provided in the position between the preparatory bonding rolland the laminating roll, for cutting the laminated film in the widthdirection at the positions projecting from the front and rear ends ofthe substrate, while the substrate and the laminated film applied tothis are conveyed, and the laminating roll may be detachably mounted onthe film cutting device and the preparatory bonding roll.
 9. A filmapplying apparatus as set forth in claim 2, wherein the diameter of thepreparatory bonding roll is made 50˜120 mm.
 10. A film applyingapparatus as set forth in claim 2, wherein the diameter of thelaminating roll is 110 mm˜300 mm, and the diameter of the preparatorybonding roll is 0.1˜0.8 times of the diameter of the laminating roll.11. A film applying apparatus as set forth in claim 2, wherein thepreparatory bonding roll is a non-heating roll.
 12. A film applyingapparatus as set forth in claim 2, wherein the preparatory bonding rollis provided with a backup roll contacting from the reverse side with thesubstrate in parallel.
 13. A film applying apparatus as set forth inclaim 2, wherein a film cutting device is provided at the downstreamside of the laminating roll, for cutting the laminated film in the widthdirection at the positions projecting from the front and rear ends ofthe substrate, while the substrate and the laminated film applied tothis are conveyed.
 14. A film applying apparatus as set forth in claim2, wherein a film cutting device is provided in the position between thepreparatory bonding roll and the laminating roll, for cutting thelaminated film in the width direction at the positions projecting fromthe front and rear ends of the substrate, while the substrate and thelaminated film applied to this are conveyed, and the laminating roll maybe detachably mounted on the film cutting device and the preparatorybonding roll.
 15. A film applying apparatus as set forth in claim 3,wherein the diameter of the laminating roll is 110 mm˜300 mm, and thediameter of the preparatory bonding roll is 0.1˜0.8 times of thediameter of the laminating roll.
 16. A film applying apparatus as setforth in claim 3, wherein the preparatory bonding roll is a non-heatingroll.
 17. A film applying apparatus as set forth in claim 3, wherein thepreparatory bonding roll is provided with a backup roll contacting fromthe reverse side with the substrate in parallel.
 18. A film applyingapparatus as set forth in claim 3, wherein a film cutting device isprovided at the downstream side of the laminating roll, for cutting thelaminated film in the width direction at the positions projecting fromthe front and rear ends of the substrate, while the substrate and thelaminated film applied to this are conveyed.
 19. A film applyingapparatus as set forth in claim 3, wherein a film cutting device isprovided in the position between the preparatory bonding roll and thelaminating roll, for cutting the laminated film in the width directionat the positions projecting from the front and rear ends of thesubstrate, while the substrate and the laminated film applied to thisare conveyed, and the laminating roll may be detachably mounted on thefilm cutting device and the preparatory bonding roll.